/* File: /home2/acoliar2/581tutors/public/assets/css/app.css */

/* ==========================================
   581 Tutors - Main Application Styles
   Phase 8: Frontend Development
   ========================================== */

/* CSS Variables for Theme */
:root {
    /* Primary Colors */
    --primary: #667eea;
    --primary-dark: #5568d3;
    --primary-light: #7c92f3;
    
    /* Secondary Colors */
    --secondary: #764ba2;
    --secondary-dark: #62408a;
    --secondary-light: #8a5bb8;
    
    /* Neutral Colors */
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    
    /* Status Colors */
    --success: #10b981;
    --success-light: #d1fae5;
    --warning: #f59e0b;
    --warning-light: #fef3c7;
    --danger: #dc2626;
    --danger-light: #fee2e2;
    --info: #3b82f6;
    --info-light: #dbeafe;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 300ms ease-in-out;
    --transition-slow: 500ms ease-in-out;
    
    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Monaco, Consolas, monospace;
}

/* ==========================================
   Reset & Base Styles
   ========================================== */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    font-size: 1rem;
    line-height: 1.5;
    color: var(--gray-800);
    background-color: var(--gray-50);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ==========================================
   Typography
   ========================================== */

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    color: var(--gray-900);
    margin-bottom: var(--spacing-md);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.75rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--primary-dark);
}

/* ==========================================
   Container & Layout
   ========================================== */

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.container-fluid {
    width: 100%;
    padding: 0 var(--spacing-lg);
}

.row {
    display: flex;
    flex-wrap: wrap;
    margin: 0 calc(var(--spacing-md) * -1);
}

.col {
    flex: 1;
    padding: 0 var(--spacing-md);
}

/* Grid System */
.grid {
    display: grid;
    gap: var(--spacing-lg);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* ==========================================
   Buttons
   ========================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    line-height: 1;
    text-align: center;
    text-decoration: none;
    border: 2px solid transparent;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-base);
    white-space: nowrap;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Button Variants */
.btn-primary {
    color: white;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    border-color: transparent;
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
    color: white;
    background-color: var(--gray-600);
    border-color: var(--gray-600);
}

.btn-secondary:hover:not(:disabled) {
    background-color: var(--gray-700);
    border-color: var(--gray-700);
}

.btn-success {
    color: white;
    background-color: var(--success);
    border-color: var(--success);
}

.btn-success:hover:not(:disabled) {
    background-color: #059669;
}

.btn-warning {
    color: var(--gray-900);
    background-color: var(--warning);
    border-color: var(--warning);
}

.btn-danger {
    color: white;
    background-color: var(--danger);
    border-color: var(--danger);
}

.btn-danger:hover:not(:disabled) {
    background-color: #b91c1c;
}

.btn-outline {
    color: var(--primary);
    background: transparent;
    border: 2px solid var(--primary);
    padding: 0.625rem 1.5rem;
    border-radius: 50px;
    font-weight: 600;
    font-size: 0.9375rem;
    transition: all 0.3s ease;
}

.btn-outline:hover:not(:disabled) {
    background: var(--primary);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.3);
}

.btn-outline-primary {
    color: var(--primary);
    background-color: transparent;
    border-color: var(--primary);
}

.btn-outline-primary:hover:not(:disabled) {
    color: white;
    background-color: var(--primary);
}

.btn-outline-secondary {
    color: var(--gray-600);
    background-color: transparent;
    border-color: var(--gray-300);
}

.btn-outline-secondary:hover:not(:disabled) {
    background-color: var(--gray-50);
    border-color: var(--gray-400);
}

.btn-outline-light {
    color: white;
    background: rgba(255, 255, 255, 0.1);
    border: 2px solid white;
    backdrop-filter: blur(10px);
}

.btn-outline-light:hover {
    background: white;
    color: var(--primary);
    transform: translateY(-2px);
    box-shadow: 0 12px 30px rgba(255, 255, 255, 0.3);
}

/* Button Sizes */
.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

.btn-block {
    display: flex;
    width: 100%;
}

/* ==========================================
   Forms
   ========================================== */

.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
    color: var(--gray-700);
}

.form-control {
    display: block;
    width: 100%;
    padding: 0.75rem 1rem;
    font-size: 1rem;
    line-height: 1.5;
    color: var(--gray-800);
    background-color: white;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-md);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-control:disabled {
    background-color: var(--gray-100);
    cursor: not-allowed;
}

.form-control.is-invalid {
    border-color: var(--danger);
}

.form-control.is-valid {
    border-color: var(--success);
}

textarea.form-control {
    resize: vertical;
    min-height: 100px;
}

select.form-control,
.form-select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3e%3c/svg%3e");
    background-position: right 0.5rem center;
    background-repeat: no-repeat;
    background-size: 1.5em 1.5em;
    padding-right: 2.5rem;
}

.form-select {
    flex: 1;
    padding: 1rem 1.5rem;
    border: none;
    background: transparent;
    color: var(--gray-800);
    font-size: 1.0625rem;
    font-weight: 500;
    border-radius: 50px;
    cursor: pointer;
}

.form-select:focus {
    outline: none;
    background: var(--gray-50);
}

.form-text {
    display: block;
    margin-top: var(--spacing-xs);
    font-size: 0.875rem;
    color: var(--gray-500);
}

.invalid-feedback {
    display: block;
    margin-top: var(--spacing-xs);
    font-size: 0.875rem;
    color: var(--danger);
}

.valid-feedback {
    display: block;
    margin-top: var(--spacing-xs);
    font-size: 0.875rem;
    color: var(--success);
}

/* Checkbox & Radio */
.custom-control {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.custom-control-input {
    width: 1.25rem;
    height: 1.25rem;
    cursor: pointer;
}

.custom-control-label {
    margin: 0;
    font-weight: 400;
    cursor: pointer;
}

/* ==========================================
   Cards
   ========================================== */

.card {
    background: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.card-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--gray-200);
    background-color: var(--gray-50);
}

.card-body {
    padding: var(--spacing-lg);
}

.card-footer {
    padding: var(--spacing-lg);
    border-top: 1px solid var(--gray-200);
    background-color: var(--gray-50);
}

.card-title {
    margin: 0;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--gray-900);
}

/* ==========================================
   Badges & Tags
   ========================================== */

.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.75rem;
    font-size: 0.875rem;
    font-weight: 600;
    line-height: 1;
    border-radius: var(--radius-full);
}

.badge-primary { background-color: var(--info-light); color: var(--info); }
.badge-success { background-color: var(--success-light); color: #065f46; }
.badge-warning { background-color: var(--warning-light); color: #92400e; }
.badge-danger { background-color: var(--danger-light); color: var(--danger); }
.badge-info { background-color: var(--info-light); color: #1e40af; }

/* ==========================================
   Alerts
   ========================================== */

.alert {
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    border-radius: var(--radius-lg);
    border: 1px solid transparent;
}

.alert-success {
    background-color: var(--success-light);
    border-color: var(--success);
    color: #065f46;
}

.alert-warning {
    background-color: var(--warning-light);
    border-color: var(--warning);
    color: #92400e;
}

.alert-danger {
    background-color: var(--danger-light);
    border-color: var(--danger);
    color: #991b1b;
}

.alert-info {
    background-color: var(--info-light);
    border-color: var(--info);
    color: #1e40af;
}

/* ==========================================
   Loading & Spinners
   ========================================== */

.spinner {
    display: inline-block;
    width: 2rem;
    height: 2rem;
    border: 3px solid var(--gray-200);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
}

/* ==========================================
   Utility Classes
   ========================================== */

/* Spacing */
.m-0 { margin: 0; }
.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }
.mt-4 { margin-top: var(--spacing-xl); }
.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }
.mb-4 { margin-bottom: var(--spacing-xl); }
.p-0 { padding: 0; }
.p-1 { padding: var(--spacing-sm); }
.p-2 { padding: var(--spacing-md); }
.p-3 { padding: var(--spacing-lg); }
.p-4 { padding: var(--spacing-xl); }

/* Display */
.d-none { display: none; }
.d-block { display: block; }
.d-flex { display: flex; }
.d-grid { display: grid; }

/* Flex */
.flex-row { flex-direction: row; }
.flex-column { flex-direction: column; }
.justify-start { justify-content: flex-start; }
.justify-center { justify-content: center; }
.justify-end { justify-content: flex-end; }
.justify-between { justify-content: space-between; }
.align-start { align-items: flex-start; }
.align-center { align-items: center; }
.align-end { align-items: flex-end; }
.gap-1 { gap: var(--spacing-sm); }
.gap-2 { gap: var(--spacing-md); }
.gap-3 { gap: var(--spacing-lg); }

/* Text */
.text-left { text-align: left; }
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-uppercase { text-transform: uppercase; }
.text-lowercase { text-transform: lowercase; }
.text-capitalize { text-transform: capitalize; }
.font-bold { font-weight: 700; }
.font-semibold { font-weight: 600; }
.font-normal { font-weight: 400; }
.text-sm { font-size: 0.875rem; }
.text-base { font-size: 1rem; }
.text-lg { font-size: 1.125rem; }
.text-xl { font-size: 1.25rem; }

/* Colors */
.text-primary { color: var(--primary); }
.text-secondary { color: var(--gray-600); }
.text-success { color: var(--success); }
.text-warning { color: var(--warning); }
.text-danger { color: var(--danger) !important; }
.text-info { color: var(--info); }
.text-muted { color: var(--gray-500); }
.text-white { color: white; }

/* Background */
.bg-primary { background-color: var(--primary); }
.bg-secondary { background-color: var(--gray-100); }
.bg-white { background-color: white; }
.bg-transparent { background-color: transparent; }
.bg-light { background: linear-gradient(180deg, #f9fafb 0%, #ffffff 100%); }

/* Borders */
.border { border: 1px solid var(--gray-200); }
.border-top { border-top: 1px solid var(--gray-200); }
.border-bottom { border-bottom: 1px solid var(--gray-200); }
.rounded { border-radius: var(--radius-md); }
.rounded-lg { border-radius: var(--radius-lg); }
.rounded-full { border-radius: var(--radius-full); }

/* Shadows */
.shadow-sm { box-shadow: var(--shadow-sm); }
.shadow { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }

/* Width */
.w-full { width: 100%; }
.w-auto { width: auto; }

/* Position */
.position-relative { position: relative; }
.position-absolute { position: absolute; }
.position-fixed { position: fixed; }

/* ==========================================
   Animations
   ========================================== */

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes fadeOut {
    from { opacity: 1; }
    to { opacity: 0; }
}

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse-ring {
    0% {
        transform: scale(0.95);
        box-shadow: 0 0 0 0 rgba(102, 126, 234, 0.7);
    }
    70% {
        transform: scale(1);
        box-shadow: 0 0 0 10px rgba(102, 126, 234, 0);
    }
    100% {
        transform: scale(0.95);
        box-shadow: 0 0 0 0 rgba(102, 126, 234, 0);
    }
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-20px); }
}

.fade-in { animation: fadeIn var(--transition-base); }
.fade-out { animation: fadeOut var(--transition-base); }
.slide-in-up { animation: slideInUp var(--transition-base); }
.slide-in-down { animation: slideInDown var(--transition-base); }
.pulse { animation: pulse-ring 2s cubic-bezier(0.4, 0, 0.6, 1) infinite; }

/* ==========================================
   Performance Optimizations
   ========================================== */

.will-change-transform { will-change: transform; }
.will-change-opacity { will-change: opacity; }

.gpu-accelerate {
    transform: translateZ(0);
    backface-visibility: hidden;
    perspective: 1000px;
}

.smooth-scroll {
    scroll-behavior: smooth;
    -webkit-overflow-scrolling: touch;
}

/* ==========================================
   Modern Header & Navigation
   ========================================== */

.site-header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 1px 0 rgba(0, 0, 0, 0.05);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: all 0.3s ease;
}

.navbar {
    padding: 1.25rem 0;
}

.navbar-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.navbar-brand img {
    height: 42px;
    width: auto;
}

.navbar-menu {
    display: flex;
    align-items: center;
    gap: 2.5rem;
}

.nav-link {
    color: var(--gray-700);
    font-weight: 600;
    font-size: 0.9375rem;
    padding: 0.5rem 0;
    position: relative;
    transition: color 0.2s ease;
}

.nav-link::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, #667eea, #764ba2);
    transform: translateX(-50%);
    transition: width 0.3s ease;
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary);
}

.nav-link:hover::before,
.nav-link.active::before {
    width: 100%;
}

.navbar-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

/* Icon Buttons */
.btn-icon {
    position: relative;
    width: 42px;
    height: 42px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gray-100);
    border: none;
    border-radius: 50%;
    color: var(--gray-700);
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
}

.btn-icon:hover {
    background: var(--gray-200);
    color: var(--primary);
    transform: scale(1.05);
}

.btn-icon .badge {
    position: absolute;
    top: -4px;
    right: -4px;
    background: var(--danger);
    color: white;
    font-size: 0.6875rem;
    font-weight: 700;
    padding: 0.125rem 0.375rem;
    border-radius: 50px;
    min-width: 18px;
    height: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 8px rgba(220, 38, 38, 0.4);
}

/* Dropdowns */
.dropdown,
.notification-dropdown,
.user-dropdown {
    position: relative;
}

.dropdown-menu,
.notification-menu,
.user-menu {
    position: absolute;
    top: calc(100% + 0.75rem);
    right: 0;
    background: white;
    border-radius: 1rem;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
    min-width: 360px;
    max-width: 400px;
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px) scale(0.95);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.dropdown.show .dropdown-menu,
.notification-dropdown.show .notification-menu,
.user-dropdown.show .user-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}

.dropdown-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--gray-100);
}

.dropdown-header h6 {
    margin: 0;
    font-size: 1.0625rem;
    font-weight: 700;
    color: var(--gray-900);
}

.btn-text-sm {
    background: none;
    border: none;
    color: var(--primary);
    font-size: 0.8125rem;
    font-weight: 600;
    cursor: pointer;
    padding: 0.25rem 0.5rem;
    border-radius: 0.375rem;
    transition: all 0.2s ease;
}

.btn-text-sm:hover {
    background: rgba(102, 126, 234, 0.1);
}

/* Notification List */
.notification-list {
    max-height: 400px;
    overflow-y: auto;
}

.notification-item {
    display: flex;
    gap: 1rem;
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--gray-100);
    transition: background 0.2s ease;
    cursor: pointer;
    text-decoration: none;
}

.notification-item:hover {
    background: var(--gray-50);
}

.notification-item.unread {
    background: rgba(102, 126, 234, 0.05);
}

.notification-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
    border-radius: 50%;
    flex-shrink: 0;
    font-size: 1.125rem;
}

.notification-content {
    flex: 1;
    min-width: 0;
}

.notification-title {
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--gray-900);
    margin: 0 0 0.25rem;
}

.notification-text {
    font-size: 0.875rem;
    color: var(--gray-600);
    margin: 0 0 0.375rem;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.notification-time {
    font-size: 0.75rem;
    color: var(--gray-500);
}

.notification-empty {
    padding: 3rem 1.5rem;
    text-align: center;
    color: var(--gray-500);
}

.notification-empty i {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.3;
}

.notification-empty p {
    margin: 0;
    font-size: 0.9375rem;
}

.dropdown-footer {
    display: block;
    padding: 1rem 1.5rem;
    text-align: center;
    color: var(--primary);
    font-weight: 600;
    font-size: 0.9375rem;
    border-top: 1px solid var(--gray-100);
    transition: background 0.2s ease;
    text-decoration: none;
}

.dropdown-footer:hover {
    background: var(--gray-50);
}

/* User Button */
.user-btn {
    display: flex;
    align-items: center;
    gap: 0.625rem;
    padding: 0.375rem 0.75rem 0.375rem 0.375rem;
    background: var(--gray-100);
    border: none;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.user-btn:hover {
    background: var(--gray-200);
}

.user-btn img {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid white;
}

.user-btn span {
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--gray-900);
}

.user-btn i {
    font-size: 0.75rem;
    color: var(--gray-600);
    transition: transform 0.3s ease;
}

.user-dropdown.show .user-btn i {
    transform: rotate(180deg);
}

/* User Info */
.user-info {
    display: flex;
    gap: 1rem;
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--gray-100);
}

.user-info img {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--primary);
}

.user-name {
    font-size: 1rem;
    font-weight: 700;
    color: var(--gray-900);
    margin: 0 0 0.25rem;
}

.user-email {
    font-size: 0.8125rem;
    color: var(--gray-600);
    margin: 0;
}

.dropdown-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.875rem 1.5rem;
    color: var(--gray-700);
    font-weight: 500;
    font-size: 0.9375rem;
    transition: all 0.2s ease;
    cursor: pointer;
    border: none;
    background: none;
    width: 100%;
    text-align: left;
    text-decoration: none;
}

.dropdown-item:hover {
    background: var(--gray-50);
    color: var(--primary);
}

.dropdown-item i {
    width: 20px;
    text-align: center;
    font-size: 1rem;
}

.dropdown-item.text-danger:hover {
    background: rgba(220, 38, 38, 0.05);
    color: var(--danger);
}

.dropdown-divider {
    height: 1px;
    background: var(--gray-100);
    margin: 0.5rem 0;
}

/* Mobile Menu */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.mobile-menu-toggle span {
    display: block;
    width: 26px;
    height: 3px;
    background: var(--gray-800);
    border-radius: 3px;
    transition: all 0.3s ease;
}

.mobile-menu {
    display: none;
    position: fixed;
    top: 78px;
    left: 0;
    right: 0;
    background: white;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
    z-index: 999;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.mobile-menu.active {
    display: block;
    max-height: 500px;
}

.mobile-menu-content {
    padding: 1.5rem;
}

.mobile-nav-link {
    display: block;
    padding: 1rem;
    color: var(--gray-700);
    font-weight: 600;
    border-radius: var(--radius-lg);
    transition: all 0.2s ease;
    text-decoration: none;
}

.mobile-nav-link:hover {
    background: var(--gray-50);
    color: var(--primary);
}

.mobile-nav-divider {
    height: 1px;
    background: var(--gray-200);
    margin: 1rem 0;
}

/* Scrollbar for dropdowns */
.notification-list::-webkit-scrollbar {
    width: 6px;
}

.notification-list::-webkit-scrollbar-track {
    background: var(--gray-50);
}

.notification-list::-webkit-scrollbar-thumb {
    background: var(--gray-300);
    border-radius: 10px;
}

.notification-list::-webkit-scrollbar-thumb:hover {
    background: var(--gray-400);
}

/* ==========================================
   Modern Hero Section
   ========================================== */

.hero-section {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 5rem 0;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    opacity: 1;
}

.hero-content {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 4rem;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-text h1 {
    color: white;
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 1.5rem;
    line-height: 1.1;
    letter-spacing: -0.02em;
}

.hero-text p {
    font-size: 1.3rem;
    margin-bottom: 2.5rem;
    opacity: 0.95;
    line-height: 1.6;
}

.hero-search {
    margin-bottom: 2.5rem;
}

.search-group {
    display: flex;
    gap: 1rem;
    background: white;
    padding: 0.75rem;
    border-radius: 100px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

.hero-stats {
    display: flex;
    gap: 3rem;
    flex-wrap: wrap;
}

.stat-item {
    display: flex;
    flex-direction: column;
}

.stat-item strong {
    font-size: 2.5rem;
    font-weight: 800;
    color: white;
    line-height: 1;
    margin-bottom: 0.375rem;
}

.stat-item span {
    font-size: 0.9375rem;
    opacity: 0.9;
    font-weight: 500;
}

.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

.hero-image img {
    max-width: 100%;
    height: auto;
    filter: drop-shadow(0 30px 60px rgba(0, 0, 0, 0.25));
    animation: float 6s ease-in-out infinite;
}

/* ==========================================
   Modern Sections
   ========================================== */

.section-padding {
    padding: 5rem 0;
}

.section-header {
    margin-bottom: 3rem;
}

.section-header h2 {
    color: var(--gray-900);
    font-size: 2.75rem;
    font-weight: 800;
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
}

.section-header p {
    color: var(--gray-600);
    font-size: 1.1875rem;
    font-weight: 400;
}

/* ==========================================
   Modern Subjects Section
   ========================================== */

.subjects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
}

.subject-card {
    background: white;
    padding: 2rem;
    border-radius: 1.5rem;
    text-align: center;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: 2px solid transparent;
    position: relative;
    overflow: hidden;
    text-decoration: none;
}

.subject-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.05) 0%, rgba(118, 75, 162, 0.05) 100%);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.subject-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    border-color: var(--primary);
}

.subject-card:hover::before {
    opacity: 1;
}

.subject-icon {
    width: 70px;
    height: 70px;
    margin: 0 auto 1.25rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    border-radius: 1.25rem;
    color: white;
    font-size: 2rem;
    position: relative;
    z-index: 1;
    transition: transform 0.3s ease;
}

.subject-card:hover .subject-icon {
    transform: scale(1.1) rotate(5deg);
}

.subject-card h3 {
    color: var(--gray-900);
    font-size: 1.3125rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    position: relative;
    z-index: 1;
}

.subject-card p {
    color: var(--gray-600);
    font-size: 0.9375rem;
    margin: 0;
    position: relative;
    z-index: 1;
}

/* ==========================================
   Modern Tutors Section
   ========================================== */

.tutors-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
}

.tutor-card {
    background: white;
    border-radius: 1.5rem;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    flex-direction: column;
    border: 1px solid var(--gray-100);
}

.tutor-card:hover {
    transform: translateY(-12px);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.15);
}

.tutor-header {
    position: relative;
    padding: 2rem 1.5rem 0;
    text-align: center;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.05) 0%, rgba(118, 75, 162, 0.05) 100%);
}

.tutor-header img {
    width: 110px;
    height: 110px;
    border-radius: 50%;
    object-fit: cover;
    border: 5px solid white;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
}

.verified-badge {
    position: absolute;
    top: 2rem;
    right: 1.5rem;
    background: var(--success);
    color: white;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.4);
}

.tutor-body {
    padding: 1.5rem;
    flex: 1;
}

.tutor-body h3 {
    font-size: 1.375rem;
    font-weight: 700;
    margin-bottom: 0.375rem;
    color: var(--gray-900);
}

.tutor-title {
    color: var(--gray-600);
    font-size: 0.9375rem;
    margin-bottom: 1rem;
    font-weight: 500;
}

.tutor-rating {
    display: flex;
    align-items: center;
    gap: 0.625rem;
    margin-bottom: 1rem;
    padding: 0.75rem;
    background: #fef3c7;
    border-radius: 0.75rem;
}

.stars {
    display: flex;
    gap: 3px;
}

.stars i {
    color: #d1d5db;
    font-size: 1rem;
}

.stars i.active {
    color: #f59e0b;
}

.tutor-rating span {
    font-size: 0.9375rem;
    color: var(--gray-700);
    font-weight: 600;
}

.tutor-subjects {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.subject-tag {
    padding: 0.375rem 0.875rem;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
    color: var(--primary);
    border-radius: 50px;
    font-size: 0.8125rem;
    font-weight: 600;
}

.tutor-info {
    display: flex;
    gap: 1.5rem;
    padding-top: 1rem;
    border-top: 1px solid var(--gray-100);
}

.info-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--gray-600);
    font-size: 0.9375rem;
    font-weight: 500;
}

.info-item i {
    color: var(--primary);
    font-size: 1.125rem;
}

.tutor-footer {
    padding: 1.5rem;
    border-top: 1px solid var(--gray-100);
}

/* ==========================================
   Modern How It Works Section
   ========================================== */

.steps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2.5rem;
}

.step-card {
    text-align: center;
    padding: 2.5rem 1.5rem;
    position: relative;
    background: white;
    border-radius: 1.5rem;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
}

.step-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.1);
}

.step-number {
    position: absolute;
    top: -20px;
    left: 50%;
    transform: translateX(-50%);
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 1.375rem;
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.4);
}

.step-icon {
    width: 90px;
    height: 90px;
    margin: 1.5rem auto 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
    border-radius: 50%;
    color: var(--primary);
    font-size: 2.25rem;
    transition: transform 0.3s ease;
}

.step-card:hover .step-icon {
    transform: scale(1.1);
}

.step-card h3 {
    margin-bottom: 1rem;
    color: var(--gray-900);
    font-size: 1.375rem;
    font-weight: 700;
}

.step-card p {
    color: var(--gray-600);
    line-height: 1.7;
    margin: 0;
}

/* ==========================================
   Modern Testimonials Section
   ========================================== */

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 2rem;
}

.testimonial-card {
    background: white;
    padding: 2rem;
    border-radius: 1.5rem;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    border: 1px solid var(--gray-100);
}

.testimonial-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.12);
}

.testimonial-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1.25rem;
}

.testimonial-header img {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid var(--primary);
}

.testimonial-header h4 {
    margin: 0 0 0.375rem;
    font-size: 1.0625rem;
    font-weight: 700;
    color: var(--gray-900);
}

.testimonial-text {
    color: var(--gray-700);
    font-style: italic;
    margin-bottom: 1.25rem;
    line-height: 1.7;
    font-size: 0.9375rem;
}

.testimonial-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 1rem;
    border-top: 1px solid var(--gray-100);
    font-size: 0.875rem;
}

.tutor-name {
    color: var(--gray-600);
    font-weight: 500;
}

.subject-name {
    color: var(--primary);
    font-weight: 700;
    padding: 0.25rem 0.75rem;
    background: rgba(102, 126, 234, 0.1);
    border-radius: 50px;
}

/* ==========================================
   Modern CTA Section
   ========================================== */

.cta-section {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    position: relative;
    overflow: hidden;
}

.cta-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

.cta-content {
    position: relative;
    z-index: 1;
}

.cta-content h2 {
    color: white;
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
}

.cta-content p {
    font-size: 1.25rem;
    margin-bottom: 2.5rem;
    opacity: 0.95;
}

.cta-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* ==========================================
   Modern Blog Section
   ========================================== */

.blog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 2rem;
}

.blog-card {
    background: white;
    border-radius: 1.5rem;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid var(--gray-100);
}

.blog-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.15);
}

.blog-card img {
    width: 100%;
    height: 220px;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.blog-card:hover img {
    transform: scale(1.05);
}

.blog-content {
    padding: 1.75rem;
}

.blog-meta {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
    font-size: 0.875rem;
}

.blog-meta .category {
    color: var(--primary);
    font-weight: 700;
    padding: 0.25rem 0.75rem;
    background: rgba(102, 126, 234, 0.1);
    border-radius: 50px;
}

.blog-meta .date {
    color: var(--gray-500);
    font-weight: 500;
}

.blog-card h3 {
    font-size: 1.3125rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    line-height: 1.3;
}

.blog-card h3 a {
    color: var(--gray-900);
}

.blog-card h3 a:hover {
    color: var(--primary);
}

.blog-card p {
    color: var(--gray-600);
    margin-bottom: 1.25rem;
    line-height: 1.6;
}

.read-more {
    color: var(--primary);
    font-weight: 700;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: gap 0.3s ease;
}

.read-more:hover {
    gap: 0.75rem;
}

.read-more i {
    transition: transform 0.3s ease;
}

.read-more:hover i {
    transform: translateX(4px);
}

/* ==========================================
   Modern Footer
   ========================================== */

.site-footer {
    background: linear-gradient(180deg, #1f2937 0%, #111827 100%);
    color: var(--gray-300);
    padding: 4rem 0 2rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2.5rem;
    margin-bottom: 2.5rem;
}

.footer-section h4 {
    color: white;
    font-size: 1.1875rem;
    font-weight: 700;
    margin-bottom: 1.25rem;
}

.footer-section p {
    color: var(--gray-400);
    line-height: 1.7;
}

.social-links {
    display: flex;
    gap: 0.75rem;
    margin-top: 1.25rem;
}

.social-link {
    width: 42px;
    height: 42px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gray-800);
    color: var(--gray-300);
    border-radius: 50%;
    transition: all 0.3s ease;
    text-decoration: none;
}

.social-link:hover {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
    transform: translateY(-4px);
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.4);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 0.75rem;
}

.footer-links a {
    color: var(--gray-400);
    transition: color 0.2s ease;
    font-weight: 500;
}

.footer-links a:hover {
    color: white;
}

.footer-bottom {
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
}

.footer-bottom p {
    color: var(--gray-500);
    margin-bottom: 0.625rem;
    font-size: 0.9375rem;
}

.footer-bottom p:first-child {
    margin-bottom: 0.5rem;
}

/* ==========================================
   Toast Notifications
   ========================================== */

.toast-container {
    position: fixed;
    top: 24px;
    right: 24px;
    z-index: 10000;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.toast {
    background: white;
    padding: 1.25rem 1.5rem;
    border-radius: 1rem;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
    min-width: 320px;
    animation: slideInRight 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    border-left: 4px solid;
}

@keyframes slideInRight {
    from {
        transform: translateX(120%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

.toast.success { border-left-color: var(--success); }
.toast.error { border-left-color: var(--danger); }
.toast.warning { border-left-color: var(--warning); }
.toast.info { border-left-color: var(--info); }

/* ==========================================
   Main Content
   ========================================== */

.main-content {
    min-height: calc(100vh - 200px);
}

/* ==========================================
   Additional Modern Enhancements
   ========================================== */

::-webkit-scrollbar {
    width: 12px;
}

::-webkit-scrollbar-track {
    background: var(--gray-100);
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(180deg, var(--primary) 0%, var(--secondary) 100%);
    border-radius: 10px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-dark);
}

::selection {
    background: var(--primary);
    color: white;
}

*:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

.glass {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.gradient-text {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}